/*!	 synfig/rendering/common/task/taskblend.cpp
**	 TaskBlend
**
**	......... ... 2015 Ivan Mahonin
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#ifndef _WIN32
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#endif

#include "taskblend.h"

#endif

using namespace synfig;
using namespace rendering;

Rect
TaskBlend::calc_bounds() const
{
    Rect ra = sub_task_a() ? sub_task_a()->get_bounds() : Rect::zero();
    Rect rb = sub_task_b() ? sub_task_b()->get_bounds() : Rect::zero();
    Rect bounds = Rect::zero();

    if (Color::is_onto(blend_method)) {
        bounds = ra;
    } else if (ra.valid() && rb.valid()) {
        set_union(bounds, ra, rb);
    } else if (ra.valid()) {
        bounds = ra;
    } else if (rb.valid()) {
        bounds = rb;
    }

    return bounds;
}

VectorInt
TaskBlend::get_offset_a() const
{
    if (!sub_task_a()) {
        return VectorInt::zero();
    }

    Vector offset = (sub_task_a()->get_source_rect_lt() - get_source_rect_lt()).multiply_coords(get_pixels_per_unit());
    return VectorInt((int)round(offset[0]), (int)round(offset[1])) - sub_task_a()->get_target_offset();
}

VectorInt
TaskBlend::get_offset_b() const
{
    if (!sub_task_b()) {
        return VectorInt::zero();
    }

    Vector offset = (sub_task_b()->get_source_rect_lt() - get_source_rect_lt()).multiply_coords(get_pixels_per_unit());
    return VectorInt((int)round(offset[0]), (int)round(offset[1])) - sub_task_b()->get_target_offset();
}